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BIOL 221 spring 2011 Q6

BIOL 221 spring 2011 Q6 - Bio 221 Name Key(Please PRINT...

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Unformatted text preview: Bio 221 Name Key (Please PRINT clearly) Quiz 6 z7mkarvol‘e,‘ er [\n \Qrwd‘ ab (49“ ”('44: (Him 1. What happens at a Shine-Dalgarno sequence? ~ -> N A A. We mRNA is spliced. ( P’°"‘°"“ ' DNA R A (7!" “Y N) B. Prokaryotic [)le begins to bejrapsgribed. C. WC ribosomes add the first amino acid to the start codon. D. Prokaryotic ribosomes bind to mRNA. 4» p. H.512, 4m; Idem, A-‘-"-- Promoter bum 6'4”“: 1(- Egg/j 2. The diagram represents a moment during the translation process. What would be the NEXT thing to happen? A. The tRNA in the P site would exit the ribosome. 5 , 3 B. A peptide bond with Pro would transfer Met to the A site. .. 7..." _ I 6 AMA A 1‘, C. A new tRNA would enter the empty P site. I :‘s M m p.94; , ,, . WK“ 5.» 6‘“ g " D. Pro We would hydrogen-bard-with Met 1am. hM‘ E. The rit’fgsome would translogate so CAA was in the A site. Be TsM'H‘A'fi“ “W (/Kflfi‘é‘), Ari mow: Met 4. ”v. A ark. kmpomm'l 3. How many different tRNAs are there in a typical bacterium? 7 A. Just one — it adapts a different amino acid to each codon A”, ,0- M‘ ‘ B. 20 — one for each of the different amino acids r. “”4 V“ \h‘k c.9965“. PMPMJ C. Between 20 and 61 — a tRNA can recognize more than one codon D. 61 — one for each of the codons in the Genetic code —- 9M7 and (a! II 44-»; Mrs ”a E. Several thousand — each gene begins with a special was sequence. was“: {arm‘s I Sham-'DGJJUM,‘ Me tflNA ' 4. A gene that is under POSITIVE control is . . . 5+5 lw‘l'w" _ A. always on’ can / indwe$l< B. usually turned on by an environmental inducer I (K i Z _ C. only able to be regulated by repression —- N?"- ”W" (M W 59' c“ » H? D. expressed until a protein binds to it to turn it off - M3 “79"" CM‘I'“ E. regulated by the binding of an activator protein fi ' 1—- P05. ConM3/49M" PrO'kaW Kuuxwl'lo' 5. Gene regulation achieved by moving a gene from a silent (cryptic) site to an expressed site M) near a promoter is called ' .H/ISWflWMMMHuJ #t-‘s'SMcgle‘wt-r A. cassette switching it fm+ 1"‘MWI‘ ' 5"!“ 7H" 7“3 ‘3' . B. response regulation - Part 7 o. 2 CR C. gene dispersal «an ewlanfie 4g"... M It»; "9%.“: 1(- c’. ”HA 13.0221. D. two component regulation ( 2 CA) - W5» kiw + Mpoau Kidder E. quorum sensing \0~1‘y/Kv20({ “that”; :47,th 4., Afitl WJmanly ...
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